Exam DP-201 topic 3 question 24 discussion

If your Azure Storage is configured with VNet service endpoint, you must use managed identity authentication

https://docs.microsoft.com/en-us/azure/data-factory/connector-azure-data-lake-storage: "A data factory can be associated with a managed identity for Azure resources, which represents this specific data factory. You can directly use this managed identity for Data Lake Storage Gen2 authentication, similar to using your own service principal. It allows this designated factory to access and copy data to or from your Data Lake Storage Gen2." B is correct

https://docs.microsoft.com/en-us/azure/data-factory/connector-azure-data-lake-storage "When you use PolyBase or COPY statement to load data into Azure Synapse Analytics, if your source or staging Data Lake Storage Gen2 is configured with an Azure Virtual Network endpoint, you must use managed identity authentication as required by Synapse. See the managed identity authentication section with more configuration prerequisites."